Freezing errors... and something else.

It's garbage when u had this.. I'm only the duped one with this error.. well so far as I can explain is : When playing a game, mostly knife matches etc. I hit my axe/knife around to hit enemies but one time in a game when doing this (this just happens randomly), then my game freezes, all I can hear at that moment is the sound when I hit someone like 'headshot' or other things like walking players. When waiting a time I press ctrl+alt+del to exit the game via windows thingy. Then I automatically get a message from ATI Technologies : Your graphical speeder is rebooted because it didn't response to the game. And sometimes, happens very rarely, I automatically get a message from crossfire : Error sended to Z8Games. This error is very annoying me, and if there's someone that can help me with this, i'd thank him very much. Heres some standard information : GFX card : ATI (But don't know what one, if theres a trick to find it please tell me.)
Computer : ACER (Also don't know exactly what one).
And if there's some more information needed, just response to this post.

By the way, theres another error, but not a freezing one again. About that X-fire thingy or something. I readed it already on the forums, and I also followed the instructions how to disable it, but it won't work. It keeps saying : Crossfire.exe keylogger detected. My antivirus is Kaspersky Internet Security 2009. If there's a costum construction for it, I will also be him very thankful. I hope someone would read this very concentrated and know what's the problem of all this, and comes to a solution. Greets, JP.